Erect perennial herb or soft shrub, 0.4-2 m tall, with few to several stems from the base or branching mainly in the upper half; stems sparingly to densely pilose. Leaves petiolate, soft; blade ovate to ovate-lanceolate or elliptic, 25-120 x 12-65 mm, subglabrous or sparingly to densely pubescent on both surfaces, copiously gland-dotted below, apex acute to acuminate, base cuneate, margin dentate or obscurely dentate only in the upper half; petiole 10-40 mm long. Inflorescence simple or sparingly branched, 50-150 mm long, verticils 4-6 mm apart; bracts persistent, broadly ovate, 4-8 mm long, abruptly tapering to base and apex; pedicels 3 mm long. Calyx densely pubescent on the outside, glabrous within, at maturity 5-6 mm long with broadly ovate to subrotund, somewhat concave upper tooth, minute lateral teeth and oblong, shortly toothed lower lip which eventually bends upwards closing the mouth of the calyx. Corolla usually white, 4-5 mm long. Stamens exserted by 4 mm.
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